The Department of the Army - Corps of Engineers is seeking a National Information Collaboration on Ecohydraulics (NICE): Numerical Models for Fish through a Cooperative Agreement. This opportunity is restricted to non-federal partners of the Great Rivers Cooperative Ecosystems Studies Unit (CESU). The goal of this project is to develop advanced numerical modeling near infrastructure with known accuracy and precision, especially in difficult-to-quantify environments such as dam gates wells, lock chambers, tailraces, and fishways. The project aims to address the challenge of allowing fish movement past locks and dams while not impacting navigation operations. The studies will help ensure the preservation and protection of numerous threatened and endangered fish species in the Mississippi River that could be impacted by a reduction in lock use. Additionally, other aquatic species will also benefit from providing hydrologic connectivity, maintaining natural ecosystem trophic balances, and biodiversity. The anticipated public benefits include aesthetic and economic value for present and future generations in areas such as recreational use, sports fishing, improved water quality, and naturally functioning ecosystems. The Statement of Interest is due on December 18, 2023, and the full proposal is due on January 19, 2024.